# 603 6th Avenue, Brooklyn

Three-family · built c. 1899 · Block 1054, Lot 5.

On Umarelli: https://umarelli.org/nyc/3010540005/603-6-avenue

More construction in South Slope: https://umarelli.org/nyc/brooklyn/south-slope.md

## Building permits

- Alteration, filed Jun 4, 2026, described as “Installation of temporary sidewalk shed as per plans. No change in use, egress or occupancy.”
- Alteration, filed May 26, 2026, described as “Installation of temporary pipe scaffold as per plans. No change in use, egress or occupancy.”
- Alteration, filed May 26, 2026, estimated cost $4K, described as “Installation of temporary roof protection as per plans. No change in use, egress or occupancy.”
- Alteration, filed Nov 4, 2022, estimated cost $1K, described as “Temporary construction fence filed in conjunction with residential building alteration and construction. Alt-co filed separately under B00779900-I1.”
- Alteration, filed Oct 27, 2022, estimated cost $133K, described as “Structural work filed in conjunction with renovated 4-story residential building. Retain existing slab on grade and partial foundation. New concrete foundation and structural framing work. Alt-co filed under separate application #…”
- Alteration, filed Sep 15, 2022, estimated cost $43K, described as “Mechanical work filed in conjunction with renovated 4-story residential building. Install new split mechanical system, kitchen and toilet exhaust fans. Alt-co filed under separate application # B00680157-I1”
- Alteration, filed Sep 15, 2022, estimated cost $47K, described as “Install full sprinkler system in conjunction with renovated 4-story residential building. Combined sprinkler fire & domestic service filed under separate pl job B00673252-I1. Alt-co filed under separate application # B00680157-I1”
- Alteration, filed Sep 15, 2022, estimated cost $102K, described as “Plumbing work filed in conjunction with renovated 4-story residential building. Install all new fixtures and related piping. New combined domestic and fire service. Alt-co filed under separate application # B00680157-I1”
- Alteration, filed Jul 26, 2022, estimated cost $53K, described as “Non-structural interior demolition work filed in conjunction with alt co B00680157-I1. Demolish interior partitions, finishes, cabinetry in preparation for installation of new under separate application.”
- Major Renovation — Multi-Family, filed May 31, 2022, estimated cost $1.4M, 3 units in all, 4 stories, described as “Demolish ex building down to foundation. Rebuild & vertically enlage building for 4-story, 3-family building on existing foundation. Reinfoce existing cellar. Related structural, mechanical, plumbing and sprinkler work filed under separate…”

## Property taxes

- Assessment: $151,080
- 2026–27 tax: $5,460
- Market value (city estimate): $2,518,000
- Taxable value: $27,516
- Assessed land: $21,840
- Assessed improvements: $129,240

## Zoning

R6B: floor area ratio 1.09 built, 2.00 allowed by base zoning.

## Recent sales

- Aug 10, 2021: $1,600,000

Open-market sales since 2016, from the Department of Finance’s sales files.

## Flood zone

Current FEMA flood map: zone X, minimal flood hazard.

From New York City and Jersey City public records, refreshed within a day of each release. Sources: https://umarelli.org/sources. Methodology and corrections: https://umarelli.org/methodology